SOLUTION: Find the third angle. y degrees, (y-20)degrees, ___________ ___

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Question 513410: Find the third angle.
y degrees, (y-20)degrees, _______________
Answer by umail08(87) About Me  (Show Source):
You can put this solution on YOUR website!
The sum of the angles of a triangle is 180 degrees, so:
Let Angle A = y degrees, Angle B = (y-20) degrees, Angle C = unknown
Angle A + angle B + Angle C = 180 degrees
Y + Y - 20 + Angle C = 180
2y – 20 + Angle C = 180
Angle C = 180 + 20 – 2y
Angle C = 200 – 2y